Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Nippon Soken, Inc.

Susumu Nogami

Yukio Suzuki

Tokio Kohama

Tsuneyuki Egami

Hiroki Matsuoka

Kimitaka Saito

Hiroshi Takahashi

Hironobu Ono

Motoharu Sueishi

Tsutomu Saito

Shuzo Yoshida

Kazuo Ueda

Kan Otsuka

Closed-loop air-fuel ratio control performed by detecting the concentration of a predetermined component in the exhaust gas, by calculating an air-fuel ratio correction factor depending upon the detected concentration, and by correcting the fuel amount in accordance with the air-fuel ratio correction factor even when the engine is warming up. This closed-loop air-fuel ratio control operation is stopped by fixing the air-fuel ratio correction factor to a predetermined value when the engine is under acceleration during warm-up.

Air-fuel ratio control method and apparatus for an internal combustion

A system for controlling the air-fuel ratio of an internal combustion engine includes a transient fuel amount increasing device for regulating the supply fuel amount in the transient state of the engine on the basis of the detection of the transient state of the engine, an air-fuel ratio deviation detecting device for detecting the air-fuel ratio deviation from the optimum air-fuel ratio, and a transient fuel increase amount correcting device for correcting the fuel increase amount in the transient state of the engine in accordance with the air-fuel ratio deviation detected by the air-fuel ratio deviation detecting device. The air-fuel deviation from the optimum air-fuel ratio of the air-fuel mixture upon deposition of a deposit on the back surface of the intake valve is prevented, and the drivability of an automobile is improved.

System for controlling air-fuel ratio in internal combustion engine

An air-fuel ratio feedback control system is disclosed in which a sensing output representing the oxygen concentration in the exhaust gas of an internal combustion engine is compared with a predetermined set value. The output of the comparator is integrated and the amount of fuel injection is corrected by being increased or decreased in accordance with the integration output having an increasing or decreasing polarity so as to control the air-fuel ratio at a stoichiometrical value. At the time of engine start, the air-fuel ratio feedback control is stopped, and this condition is held after engine start. Further, the holding function is cancelled by a signal representing the activation of the detection output of the oxygen sensor.

Air-fuel ratio feedback control system

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Toyota, Japan

Susumu Nogami